title: Isolation of rabbit bone marrow mesenchymal stem cells using density gradient centrifugation and adherence screening methods.
abstract: OBJECTIVE
  Under special conditions, bone marrow mesenchymal stem cells (BMSCs) can differentiate into osteoblasts and chondroblasts. However, MSCs are few in bone marrow. How to harvest, purify and rapidly proliferate in vitro is a foundation of application in tissue engineering technique. To optimize, collect, purify, assess rabbit BMSCs and to observe the biological character of BMSCs.
  
  
  METHODS
  Two female New Zealand rabbits aged 2 months were used for MSC collection and primary culture. Bone marrow solution was purified by density gradient centrifugation and adherence screening method. Culture solution was obtained. BMSCs were incubated in phosphate buffered solution (PBS), supplemented with 2.5 g/L trypsin (3.0 mL), and placed in an incubator at 37 °C for two or three minutes. Cell morphology was observed using an inverted microscope. The digestion was stopped when cytoplasm recovery, long and thin cells with large intercellular space, and few round cells appeared. Subsequently, BMSCs were incubated in serum-free L-DMEM, and placed in a plastic culture flask at 1.0×108/L. MSC morphology, ultrastructure and surface marker; proliferation of the first, third, fifth, eighth and tenth passages of BMSCs; cell growth curve was drawn. BMSCs was pure following density gradient centrifugation and adherence screening method. The third and fifth passage of cells had typical whirlpool-shape.
  
  
  CONCLUSIONS
  Transmission electron microscope demonstrated that round or oval MSCs possessed large nuclei, big nucleus proportion, a few cellular organ. These were low-differentiated cells. Growth curve of cultured MSCs was "S" shape. The first, third and fifth passage cells had strong reproductive capability. The eighth and tenth passage of cells had significantly reduced proliferation. Cells isolated were positive for CD44 and CD90, but negative for CD34. These were low-differentiated cells under the electron microscope. Isolated cells are MSCs, with the property of stem cells. The third and fifth passage cells are pure, with strong reproductive capability.
authors.affiliation: Department of Orthopedics, The Affiliated Hospital of Medical College Qingdao University, Qingdao, China - xcs009@163.com.
authors.forename: C S
authors.initials: CS
authors.lastname: Xia
authors.forename: A J
authors.initials: AJ
authors.lastname: Zuo
authors.forename: C Y
authors.initials: CY
authors.lastname: Wang
authors.forename: Y Z
authors.initials: YZ
authors.lastname: Wang
mesh_terms: D000818:Animals; D018952:Antigens, CD34 / Q000032:analysis; D001854:Bone Marrow Cells / Q000166:cytology* / Q000276:immunology / Q000648:ultrastructure; D002448:Cell Adhesion; D018929:Cell Culture Techniques; D002469:Cell Separation / Q000379:methods*; D002499:Centrifugation, Density Gradient; D005260:Female; D018960:Hyaluronan Receptors / Q000032:analysis; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000276:immunology / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D011817:Rabbits; D018800:Thy-1 Antigens / Q000032:analysis
chemical_list: D018952:Antigens, CD34; D018960:Hyaluronan Receptors; D018800:Thy-1 Antigens